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First of all, 30ma seems a little high for a yellow LED. I'm used to 20ma for yellows, higher for blue and white, although it will work higher (and be brighter). Since it's just your computer, it won't matter if they burn out in 3 years rather then 10.
Second, since they are series, the total current draw for both is 30ma, not 60ma.
It doesn't matter whether you put the resistor before or after the LEDs.
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